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PUMP.

Patented o@t.'14, 1884.

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(No' Model.)

J. W. DOUGLAS.

N. PETERS. Plwxovumngnpner. wnmgwn, D. c.

` Unir-rn rrares JOSEPH XV. DOUGLAS, OF MIDDLETOVN, CONNECTICUT, ASSGNORTOHIM- SELF AND XV. AND B. DOUGLAS, OF SAME PLACE.

PUMP.

.SPECIFICATOI forming part of Letters Patent No. 306,679, dated October14, 1884.

Application filed September' 5, 1383.

To all whom, it may concern,.-

Be it known that l, JosEri-r W. DOUGLAS, a citizen of the United States,residing at Middletown, in the county of Middlesex and State ofConnecticut, have invented new and useful Improvements in Pumps, ofwhich the following is a specification.

My invention relates to force-pumps, and has for its object to simplifyand cheapen the construction of the saine, and to provide adouble-acting force-pump which shall possess great strength 'anddurability, and in which danger of leakage from imperfect joints isobvviated.

To this end, therefore, my invention consists in a pump having twoworking-cylinders, one above the other, and each having a piston carriedby the same rod, the upper cylinder being surrounded by an air-chamber,and having two eduction-ports, the whole being cast in a single piece,whereby great strength and durability are secured and danger of leakagefrom imperfect joints is avoided, while the cost of manufacture is atthe same time reduced to a minimum.

Referring to the drawings forming part of this specication, Figure lrepresents a central vertical section of the pump-cylinder andair-chamber surrounding it, and Fig. 2 is a side elevation showing thepump with its operating parts.

A in said drawings represents a suctionpipe leading from the well orother watersource. Upon the end of this pipe is mounted a cylinder, B,the entrance to which is covered by an upwardly-opening elack-valve, a.

W'ithin the cylinder B reciprocates a piston-head, C, having apuppet-valve, c, which opens as the piston descends and allows the waterin the cylinder B to iiow in above said piston. The latter is mountedupon a pistonrod, D, which is reciprocated by a pump-handle in t-heusual manner.

Above the chamber B, and concentric there-I with, is formed a secondworking-cylinder, E, of less diameter, havinglits lower end open.NVithin this cylinder reclprocates a piston, d, mounted upon the rod D;and operated thereby.

F indicates an air-chamber surrounding the (No model.)

tapped pipes f/ g, which may unite above in a single discharge-tube.

The part-s composing the lower cylinder, the upper cylinder, theair-chamber surrounding the latter, and the eduction-ports are all castin a single piece, whereby greater strength is 6o obtained, all jointsare avoided, and the cost of production is materially decreased.

lt is well known that in force-pumps where the water is under heavypressure in the working-cylinders there is constant danger of leakagethrough the joints, and frequent attention and renewal of the packingbetween the joints is necessary. My invention obviates thesedifficulties, besides securing other advantages.

The operi tion of the device is clear from 7o the drawings. As thepiston C moves downward, the elack-valve a closes, the puppetvalve@ inthe piston opens, and water flows in above it. At the same time thedescent of the piston d in the upper chamber, D, drives the water out ofthe latter through the educ- VJtion-ports r/ g. As the piston C rises,the valve c closes and the water above it is driven out through thedischarge-pipes, while at the same time the chamberB is filled, throughthe valve So a, by water flowing from the suction-pipe A. ln this mannerthe forcing mechanism acts `upon both the up and the down stroke, givinga continuous stream through the dischargepipe.

In Eio'. 2 of the drawings l have shown the attachments belonging to theparts hereinbefore described. In this gure l designates the base whichforms a portion of the cover for the well, and upon which is placed thetubular upright I. The discharge-pipes ,f/ g pass upward throughopenings in this base-piece, and lie upon each side of the tubularupright I', being coupled thereto by an adjustable bridge-piece, L,which encireles all three and is supported by abrace-rod, L, the lowerend of which rests upon the base-piece I, or upon the parts surroundingthe same. lt will be seen that by making the bridge-piece L adjustableupon the tubular upright and pipes the former IOO may he adjusted to anypoint'l within ce1-tain 1:11' uplighblf,thedisehalfge-pipeSf/,tlmbridgelimits, as may be required by the depthofthe I piece L, adjustable ou the pipes and tubular oistern or othereiic-unistauees. upright, and a brace-rod, L', connecting the 15Havingthusdeseribedmy i11ve1xtio11,\vhat l bl'idge-pieee with the base,substantially as claim sdescribed.

il.. A force-pump having` two pulnp-eylinl In testimony wheieoflhavehereunto Set my ders, 011e above the other, the upper cylinder i hand inthe presence of two subscribing Witbeing east integral with aSurrounding aiimesses.

chamber, and a discharge-port at one side of JOSEPH W'. DOUGLAS. 1 o theai rehan1he1', Substantially as shown and de- Witnesses:

scribed. JOHN N. CAMP,

2. The combination of the hase I, the tubu- Ginollzoi. A. Gm re.

